_________________Say, can you feel the thunder in the air? Just like the moment ’fore it hits – then it’s everywhereWhat is this spell we’re under, do you care? The might to rise above it is now within your sphereMachinae Supremacy – Sid Icarus

One question though. When watching AA videos their rocket hangs in the air like a rock. It does not swerve or tilt. What is different about your control algorithm? Do you simply have more aggressive coefficients in case something extreme happens or do you have less control authority in your actuators?

One question though. When watching AA videos their rocket hangs in the air like a rock. It does not swerve or tilt. What is different about your control algorithm? Do you simply have more aggressive coefficients in case something extreme happens or do you have less control authority in your actuators?

Keep up the good work!

~Daniel

Funny thing is: back during the 2009 NGLLC runs it looked like it was just the other way round

Can you tell us a bit how you prevent gases from entering the fuel flow during engine shutdown. I can imagine that during the zero G phase this is an issue

cheers,c.

A relevant question. The answer is that we simply didn't bother to do anything about it. Because it was restarting so close to the ground, the tanks were still mostly full, and the bit of aero drag on the way down plus the engine purge was enough to settle the propellants.

One question though. When watching AA videos their rocket hangs in the air like a rock. It does not swerve or tilt. What is different about your control algorithm? Do you simply have more aggressive coefficients in case something extreme happens or do you have less control authority in your actuators?

I'm not sure what you mean. It swerves or tilts when it wants to go somewhere, we have a wild amount of control authority. The computer is actually set to use about half of the physical gimbal range right now.

To hover, you want the engine thrust line right through the CG, and that line the same as the gravity vector. To move sideways, you have to get the CG off that vector, so the vehicle essentially "falls" in the direction you want it to go.

If you link to specific videos, I can speak to what it's doing. The MSS control system is higher frequency and more tightly wound that AA's, I've seen both companies do flights recently.